155010661 has 4 divisors (see below), whose sum is σ = 166934572. Its totient is φ = 143086752.

The previous prime is 155010643. The next prime is 155010671. The reversal of 155010661 is 166010551.

155010661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 55130625 + 99880036 = 7425^2 + 9994^2 .

It is a cyclic number.

It is not a de Polignac number, because 155010661 - 2⁷ = 155010533 is a prime.

It is a super-3 number, since 3×155010661³ (a number of 26 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (155010631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5961936 + ... + 5961961.

It is an arithmetic number, because the mean of its divisors is an integer number (41733643).

Almost surely, 2^155010661 is an apocalyptic number.

It is an amenable number.

155010661 is a deficient number, since it is larger than the sum of its proper divisors (11923911).

155010661 is a wasteful number, since it uses less digits than its factorization.

155010661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11923910.

The product of its (nonzero) digits is 900, while the sum is 25.

The square root of 155010661 is about 12450.3277466900. The cubic root of 155010661 is about 537.1808508116.

The spelling of 155010661 in words is "one hundred fifty-five million, ten thousand, six hundred sixty-one".